I'm sure RLR will give you some reassurance.  In the meantime, feel reassured that you have had tests, including an EKG, and everything was normal.  They wouldn't have let you go home if you were in any danger.
Hope this helps a little.

Thanks guys   this is just so annoying, mostly happens when I'm in the car   I get a feeling for a second that all the blood has drained from my arms n legs and go all hot, it's soooooo scary   thanks again xxx

Okay, your symptoms would be consistent with threshold events associated with significant anxiety, more commonly known as panic attacks. Accidental ingestion of 80mg of citalopram would not have caused any harm and there are recorded cases of persons surviving after consuming a much, much greater dose so you need to relax from that standpoint.

You don't mention whether this is your first child but realize that in many such cases, new moms suddenly feel overwhelmed by the responsibility for bringing a new life into the world and these perceptions can cause a sense of helplessness. Thoughts such as feeling incapacitated to the extent that they either cannot provide for their child and family or succumb to an untimely demise and thus leave their child abandoned and helpless are extremely common irrational fears. Focus upon health becomes paramount and any sign of perceived distress such as benign palpitations which are thought to be a sign of heart trouble, can induce constant vigilance and fear that their life may be hanging in the balance.

Realize that the innate urge to protect one's young by sensing danger is sometimes distorted in contemporary human beings because such threats are non-existent by comparison to circumstances in early homo sapiens. It's critical to understand that nothing is actually wrong with you, but the influence of very basic instincts can compel some mothers to become extremely fearful that danger is close and that the safety of their child may be in jeopardy. The compelling nature of these instincts is designed to afford the greatest survival potential of the species, much like you might witness in lower animal forms.  Again, however, it is merely a perception and innate response. You or your child are actually in no danger at all.

Lowered heart rate while in bed is an entirely normal phenomenon and when supine, or laying flat, the heart does not have to work as hard to overcome the effects of gravity upon blood flow, together with the fact that vascular tone is reduced when lying in bed and preparing for sleep.

Feeling light-headed and "spacey" is a classic manifestation of anxiety and results from mild dysautonomia and disturbed sensory feedback. It is not a warning sign of any kind. The chest pain is, again, a feature of significant anxiety and does not suggest anything is wrong.

You're going to be just fine. Take a breath and relax. Although I realize that my response is quite belated, you're in no danger and nothing is wrong with your health.

Best regards,

Rutheford Rane, MD (ret.)